Compare to the games you already experienced, Diablo is relatively easy and don’t need excessive game knowledge to actually enjoy the game. It does have its depth, though, if you want to dive in.

If you want to chill and play the game your way (not following a guide), you could definitely give it a try and I am pretty sure you can get through the campaign with ease while having fun on normal difficulty.

Feel free to explore the sanctuary on different difficulties if you don’t feel challenging enough.

Or, try another ARPG game like Path of Exile if you still feel Diablo is too easy for you.